Is there a photo policy? Can a bride and groom take photos on the stair case?

Saw no policy. Better do your own research.

Not sure of the policy

Yes

Usually when an organized group wants to film or have an organized photo shoot in a public place, there are ordinances that requires the group to either register or get a permit to do so. You should contact the public relations department for the courthouse directly, so you don't end up with a surprise! Because what happens if there are 10 other wedding parties wanting to do the same thing, at the same time?

I don't see why not.... I took photos throughout the building

I think so people do it all the time

Last time i was there, there was a wedding taking place upstairs.

I would run it by them, if you're looking for a place to take photos for your wedding. If I was a manager there, you would have my blessing :D